Introduction to Monostable Multivibrator

• The monostable multivibrator is constructed using the 555 IC.
• It operates in one-shot mode.
• It has one stable state.

Block Diagram of 555 IC

• It is essential to understand the block diagram well.
• Prior knowledge about it is necessary.

Working of Monostable Multivibrator

• On triggering, the output becomes high, then after a short duration, it becomes low.
• An external trigger is required to keep the output high.

Pin Configuration of 555 IC

• Pin 1: Ground
• Pin 2: Trigger Input
• Pin 3: Output
• Pin 4: Reset (connected to the ground)
• Pin 5: Control Voltage (grounded with a capacitor)
• Pins 6 and 7: Short-circuited for register and capacitor

Working of the Circuit

• The resistor and capacitor together determine the high time of the output.
• The output remains low until another trigger is received.
• The charging and discharging process of the capacitor is crucial.

Voltage and Output

• The output becomes high only when the capacitor’s voltage crosses the reference voltage.
• The voltage at the transistor’s base changes the state of the circuit.

Principle of Operation

• The output time on high depends on the value of the resistor and capacitor.
• Calculating the high time is essential.

Conclusion

• The circuit, block diagram, and working of the monostable multivibrator were explained.
• This circuit is based on timing and trigger events.

Hope this information has been useful to you.